Something like:

chomp(my $library = <DATA>);
chomp(my $PIN = <DATA>);
while (my $line = <DATA>) {
    chomp($line);
    if ($line =~ /^library/) {
        $library = $line;
    } elsif ($line =~ /^PIN/) {
        $PIN = $line;
    } else {
        print "$library:$PIN:$line\n";
    }
}
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